topic Re: Mosaic to new raster in Data Management Questions

Mosaic to new raster

MichL — Thu, 11 May 2017 00:30:45 GMT

I have 33 DEM tiles that I am trying to mosaic together using this tool in ArcGIS Desktop,

but I keep getting strange results.

All of the DEM pixel depths/sizes are 32 bit float, 1 band and are in NAD83, which I have been specifying in the tool. I'm saving it to a gdb and not specifying a cellsize. I am also leaving the mosaic operator and colormap modes as the defaults. This is the result I am getting:

Wondering if anyone knows why this is happening.

I tried using a mosaic dataset, but I am having issues with performing additional manipulation of it after I added all of the tiles. I would prefer to use the mosaic to new raster as I know the additional analysis and manipulation I need to perform has worked in the past.

Re: Mosaic to new raster

AbdullahAnter — Thu, 11 May 2017 01:02:24 GMT

Could you change mosaic operator to Mean and retry?

Re: Mosaic to new raster

JayantaPoddar — Thu, 11 May 2017 12:47:59 GMT

If you are able create a Mosaic Dataset > Load the Rasters to it, then you could use Copy Raster to convert the Mosaic Dataset to a Raster Dataset.

Re: Mosaic to new raster

IanMurray — Thu, 11 May 2017 13:21:49 GMT

Someone else recently had this issue and it was solved by creating the new mosaic in a regular folder then moving the resultant raster back to the gdb.

https://community.esri.com/thread/194308-toruble-with-lidar-data-and-using-the-tool-mosaic-to-new-raster-with-multiple-images

Re: Mosaic to new raster

MichL — Thu, 11 May 2017 17:03:34 GMT

Thanks for the reply Abdullah!! I tried your suggestion, but now I got this as the result:

I'm going to try the other suggestions now. Hopefully one of these works!!

Re: Mosaic to new raster

AbdullahAnter — Thu, 11 May 2017 17:32:29 GMT

Could you check by create this mosaic with mosaic dataset instead of mosaic to new raster.

and please snapshot of footprint of raster.

Re: Mosaic to new raster

ChrisCatania — Thu, 11 May 2017 23:24:33 GMT

HI Mich - Thanks for asking your questions and welcome to the GeoNet community! I wanted to let you know that we're moving your question from the GeoNet Help group to the https://community.esri.com/community/gis?sr=search&searchId=00654b19-947b-4193-836a-6470cab8eb7f&searchIndex=0‌ space so our Esri and user subject matter experts can further help answer this and future questions. So you're aware on how and where to post your questions, here's a few quick tips and reminders:

First, use the GeoNet search (top right corner by your profile icon) to search and see if your question has already by asked/answered previously.
If not, than we suggest reviewing the GeoNet Community Structure, to find the most relevant space to post your question.
The GeoNet GeoNet Help group is for questions and tips on how to use the GeoNet community platform not the Esri ArcGIS platform. Following steps 1 & 2 above will give you the best results for getting Esri product questions answered.
This GeoNet 101 "How to Ask Questions on GeoNet" post is also a helpful guide to asking questions: https://community.esri.com/community/help-and-feedback/blog/2016/08/15/community-news-and-tips-how-to-ask-questions-and-get-answers

Thanks again for contributing and I hope this helps and let us know if you have any questions.

Re: Mosaic to new raster

TheoFaull — Fri, 12 May 2017 07:52:42 GMT

Hmmm, I used to run this same tool.

Try finding out the cell size of the seperate rasters and input that number into the cell size option in the tool, so you know the cell size is the same throughout the process. Export to GRID format too. I find it's the most ESRI friendly.

Re: Mosaic to new raster

MichL — Sat, 13 May 2017 17:48:01 GMT

This solution worked. Thank you very much. Strange that you have to do it this way though.

Re: Mosaic to new raster

MichL — Sat, 13 May 2017 17:48:56 GMT

I didn't get to try this suggestion. It may work, but I didn't have the rasters in a gdb, only a regular folder and it would take time to import them and then try this.

Re: Mosaic to new raster

MichL — Sat, 13 May 2017 17:50:22 GMT

Thank you for the information Christopher. I wasn't sure where to post, but now I know.